Automatic regulator



A. W. GREENE.

Au'oMAnc REGULATOR.

PPLlCATION FILED J^N.22 1917.

4 SHEETS-SHEET l.

J. W Greeize attorney Patented Feb. 24,1920.

A. W. GREENE.

Auemmc REGULATOR. APPLICATION FILED JAN.22| 19417. .l 1,331,867, Patented Feb. 24,1920.

4 SHEETS-SHEET 2.

@a g4 es 3mm/Hoz @imam l ez... XJMJRO A. w. GRENE.

AUTOMATIC REGULATOR.

APPLlcAlonT FILED 1AN.22, 1911.

4 SHEETS-SHEET 3- @Honnef A. W. GREENE.

lAUTOMATIC REGULATOR. APPLICATION man 1An.22.19|1.

1,331,867. y Patented Feb.24,1920.

` 4 SHEETS-SHEET 4.

'.gigigign- .ARTHUR WLLIAMSON GREENE, 0F RCHMOND, VIRGINIA.

AUTOMATIC REG-ULATUR.

Specification of Letters Patent.

Application filed January 22, 1917. Serial No. 143,796.

To all Iwhom t 'may concern.'

Be it known that l, ARTHUR W.` GREENE, a citizen of the United States, residing at Richmond, in the county of Henrico, State of Virginia, have invented certain new and useful Improvements in Automatic Regulators; and l do hereby declare the follow-- ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to regulators for condition controlling devices such as are used for controlling conditions in various machinery and processes, as for instance, the controlling device for controlling either or both of the draft conditions andstoker conditions in a boiler'furnace so that the boiler pressure is controlled.

ln devices of this character heretofore used, where electrical control has'been attempted the usual expedient has been to operate a controlling device when the condition exceeded a predetermined maximum or fell below a predetermined minimum lby closing an electric circuit. yThe difficulty with existing devices of this description has been that the controlling device could not be caused to operate with"sulicient delicacy to instantly restore the conditions which had varied from abnormal to the normal 'conditions. For instance, it has been common to control furnace dampers by closing a circuit through pressure actuated means. This circuit operates, in the usual construction, a motor which opens or closes the damper. Experience has shown that when a. boiler, under these conditions, starts to increase its pressure, as for instance when part of the load is thrown oii, the increase of pressure will not stop at the maximum limit but will exceed that limit considerably. Now with the ordinary construction as above noted the motor will a'ctuate continuously until the damper is entirely closed. This cuts odthe draft from the boiler furnace and the steam begins to decrease in pressure, which decrease in pressure swings over, due to the closed damper, to the minimum side but owing to the closed damper does not stop at the minimum limit but swings greatly below the desired minimum. llhis pendulum like action takes place until the swinging has been reduced after which, if the external condition, such as the load, be maintained Patented Feb.; 2d, i920 uniform, a better maintenance of the condi tions in the 'boiler may be obtained.

One important Aobject of the present invention is t0 provide an improved form of apparatus for regulating the condition controlling devices which 1s" so arranged that the oscillations of the conditions due to sur ing beyond the desired maximum and minimum points are dampened or checked in sucli manner that surging is entirely eliminated and in consequence a better adherence to the desired normal condition is obtained.

Furthermore, in all regulators oi this character heretofore used there is employed an element which varies in position between limits, the variations being eected by variation of the condition to be controlled. To limit the movement of these elements, such as the hand of a pressure gage, a thermostat bar or the like, unduly stresses the movable element.

Another important object oi the present invention is to provide an improved forni of regulator equipped with a moving element controlled by variation in the condition to be controlled which moving element is capable of non-resisted movement beyond the desired limit of variation oi' such condition.

A third important object of the invention is t0 provide an impro-ved form of regulator for condition controlling devices and which employs an element variable with decremental and incremental differential variations of the condition to be controlled, the regulator being arranged to integrate these differential variations so as to produce a step by step movement in the condition controlling device. Where the ultimate condition to lbe con-A trolled is that of pressure the devices at present in use employ either a piston movable in a cylinder, or more generally an expansion cell, the usual type of which consists of a pair of diaphragme connected at their peripheries and having their centers movable,

one toward or away from the other according as the pressure decreases or` increasesa The first of these devices, the piston and cylinder, is open to the objection that it is ractically impossible to maintain a tight 't between the wall of the cylinder and the periphery of the piston. The 4second of these devices is open to the objection that the di'erential the device as variations in the condition to be controlled do not operate to produce asmooth and regular difference in distance between the centers of these diaphragms, but owing to the inequalities inherent in suoli construction, the device controlled by the diaphram will jump or jerk from one 'position to the other.

Experience has shown that there is but one device which will, without leakage, produce a smooth and uniform movement of the actuating element of such a regulator as the present and this device is a Bourdon tube.

A further important object of t-he invention is to provide a regulator for condition controlling devices wherein the actuating element of the regulator is operable by means of a Bourdon tube.

Vith the above and other objects in view, as will be hereinafter apparent the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, accompanying drawings, claimed.

ln the acco-mpanying drawings, like characters of reference indicate like parts in the several views, and

Figure 1 is a diagrammatic View of the wiring connections used with one form of the invention.

Fig. 2 is a similar diagrammatic view of the wire and connections used with a second form of the invention.

Fig. 3 is a detail side elevation of a certain switch used herewith.

Fig. 4 is a vertical section .through said switch.

Fig. 5 is a -front elevation of one preferred form of circuit closer` used herewith.

Fig. 6 is a side elevation of the circuit closer shown in Fig. 5.

and specifically Fig. 7 is a plan View of such a circuitk closer.

Fig. 8 is a side elevation of a second preferred form of circuit lcloser.

Fig. 9 is a detail section on an enlarged scale, the section being taken on the line 9-9 of Fig. 5.

Fig.'10 is a diagram of the conta-ct rings and the gaps in the cylindrical switch used in connection with the second form of the invention.

Considering now the general operation of disclosed in the form shown in Fig. 1 it will be observed that there is provided a 'pair of line wires 10 and 11 which receive their current from any suitable source of supply, the latter not being deemed necessary to be shown. One of these wires, as 10, is connected by means of a wire 12 with the movablel element 13 of the circuit closer, this element being controlled by the variations in the condition to be regulated or controlled. For instance, where the condition to vbe con 05 trolled is one of temperature the element -13 illustrated in the i and 27. Other brushes 24, ring v23,

Leanser may be, if desired, a thermostat bar or may be a lever connected by suitable linkage to a thermostat bar. ln other instances, as where the condition to be controlled is one of pressure, the element 13 may take the form of a lever suitably pivoted and operatively connec-ted to a Bourdon tube in order to aford smooth and uniform movement of this element under variations in the condition to be controlled due to variations in pressure. lt will be obvious that various other ways for controlling the element 13 will suggest themselves, the manner of controlling this element being dependent on the character of the condition to be controlled. Adj acent that end of the ,element 13 which has the greatest amplitude of movement 'there is pro-vided a series of contact-points 14, 15, 16 and 17 and fixed in the paths of these points arey yieldable contacts 18, 19, 20 and 21, the contacts 14 to 17 and contacts 18 to 21 being so disposed that'the contacts 14 to 17 will successively engage the contacts 18 to 21. Moreover, while in the present instance, there has been shown a series of but four sets of contacts yet the number of contacts may be varied -at will in accordance with the extent and character of the control desired.

rThe switch used herewith is in the form of an insulating drum 22-and surrounding this drum adjacent one end is a conductor band 23.A Also surrounding the drum partially, are other conductor bands 24, 25, 26 and 27 in each of which there is provided a gap 28, these last bands being each connected to the band 23. Wires 29, 30, 31 and 32 are connected respectively at one end to the contacts 18, 19, 20, and 21 and at the other end to brushes 33, 34, 35, and 36, these brushes bearing respectively against the bands 24, 25, 26 37', 38, 39 and 40 (bear against these bands 24 to 27 respectively at points spaced from brushes 33 to 36. These last-mentioned brushes are connected by wires 41 in multiple to a wire 42, lamps 43 being connected into the wires 41 respectively, and being used as indicators only and not necessary to the operation of the controller.

At 44 is a motor controlled, as hereinafter described by the switch and mechanically connected to the shaft 45 of the drum by a gear train 46. Now, let us consider what takes place when the member 13 is actuated to successively close the contacts 18, 19, 2O and 21. In this connection it is to be noticed that the gaps 28 are spaced around the drum 22 so that no two of these gaps are in alinement longitudinally of such drum. If the left'hand end of the member 1.3 in Fig. l moves upward it first closes the contact 18, the contact '14 striking sa id contact 18. Then a circuit will be established from the line Wire 1() through the wire 12, member 13, contact 14, contact 18, wire 29, brush 33, ring brush 49, wire 48, relay or coil 47, wire 50, back to wire. 11, exciting relay, causing plunger 51 to rise making contact between contact 52, and contact 53, thus making circuit from wire 11, contacts 53, 52, wire 54, wire 55, wire 67, to motor 44, which in turn will rotate the switch drum 22, until the gap 28 of the ring 24 comes opposite brush 33. Finger 33 rests on gap 28 and is not now connected with ring 23, thus breaking circuit established, and the motor will stop an-d consequently the movement of switch 22 will likewise stop. If now the arm 13 rises still further until the contacts 15 and 19 are broughtinto engagement, then a circuit similar to that just described vwill be formed through the ring 25, ring 23, brush 49, wire 48, relay 47, wire 50, wire 11, and the switch drum 22 will be turned until gap 28 in ring 25 comes opposite the finger 34. The circuit will again be broken and the motor stopped. This continues throughout the remainder of the movement of the arm 13. Thus it is to be noted that the differential movement of the arm 13 produced by diierential variations in the condition to? be controlled will result in an integration of this movement by means of the switch so that the movement is caused to assume a step by step form upon gradual upward movement of the arm 13.

At 47 is a relay magnet which is connected by a wire 48 with'a lbrush 49 engaging the ring 23. Furthermore, this magnet is connected by a wire 50 with the wire 42 and consequently to' the line wire 11. Thus whenever the. mem-ber 13' is moved so as to close a circuit through one of the rings 24 to 27 a band circuit will 1be closed through the magnet 47 which will result in moving the core 51 of this magnet to close a. circuit through contacts 52 and 53, the contact 52 being connected by al wire 54 with a motor lead 55 while the contact 53 is connected to vthe wire 42 and thus to the line wire 11.

At 56 is a second motor lead which is connected by a wire 57 with the line wire 10.

In order to reverse-themovement of the controlling -device the member 13 is provided with an arrangementoperative upon movement of said member in a downward direction, and although lan integrated action would be preferably embodied in this arrangement, vfor the sake of clarity the bar 13 is provided in the present instance with'a single contact point 58 which is adapted, when said member 13 moves away from the contact 18, to engage a contact 59 which is connected by a wire 60, lring 60 (return limit), wire 60 with relay magnet 61, the

other end of the magnet winding being con' nected to the wires 42 and 11. Thisrelay magnet controls contacts 62 and 63 and the contact 62 is connected to the wires 42 and 11 while the Contact 63 is connected by" a wire 64 with a motor lead 65. By this will revolve in the opposite direction.

mea-ns w'hen the contacts 58 and 59 are brought into engagement current will flow through the magnet 61 and thus energize the leads 56 and 65. Condensers 66 are preferably connected in multiple between the wire 60 and line wire 10 and also between' the ring 23 and line wire 10, as clearly shown.

Extending from the leads 55, 56 and 65 are motor connecting wires 67, 68 and 69. The nio-tor is preferably a double field motor, the field windings being indicated respectively at 70 and 71 and the wire 67 is connected to the winding 70 while the wire 4 68 is connected to the winding 71, so that when current passes over the wire 67 the motor will revolve in one direction and when current passes over the wire 68 the mopr .7 means of this construction the motor may be caused through the varying of the conditions to be controlled, to revolve in one direction or the other and thereby actuate the switch -in one direction or the other, an A. C. three phase motor may be used where reversal of rotation is desired, the relay switch to motor being double pole cross connected, so as to give forward and reverse rotation as the case may be.

In the form of the device shown in Fig. 2, the line wires in which there is a pole changing switch P are indicated respectively at and 81. The line wire 80 is connected to the movable circuit closer 82 which carries contact points 83, 84, 85, and 86. In the paths of these contact points ,are arranged yieldable contacts 87, 88, 89 and 90, the contacts 83 to 86 and 87 to 90 being so arranged that movement of the bar 82 brings the contacts 83 to 86 successively into contact with the contacts 87 to 90, the latter contacts being spring supported as in the previous case. Each of the contacts 87 to 90 has leading therefrom a wire 91 which is connected to one of a series of relay magnets 92, 93, 94 and 95, these magnets all be-.

ing connected in multiple by Wires 96 to the line wire 81. Each of the magnets 92 to- 95 .is provided with an armature 97 which is normally held away from its magnet by means of a spring 98 pulling on an arm 99 attachedto the armature and each armature is further provided with a dash-pot 100 for the purpose of rendering its movementl Fig. 2 consists of an insulating drum 123 whereon is mounted a series of contact strips 124 whereon yrests the respective ingers or brushes 111 to 111 and 1'19 to 122. The ends of each of these strips 124C are so spaced that one of each pair o the fingers or brushes as 111 and 119 will at all times rest on the strip 121. Moreover, all of the strips are connected by wires 124Ca to a ring 125 and to a second ring 126. Bearing on the ring 125 is a' brush or :inger 127 which is connected by means o1 a wire 123 with a magnet 129, this magnet being one of the magnets of a double throw relay. 1n like manner the ring 126 has bearing the-reagainst a brush orfnger 130 which is connected by a wire 131 with the other magnet 132 of said double throw relay. Between the magnets129 and 132 is located an armature 133 so that when the magnet 129 is energized the armature i's drawn in one direction While, when the magnet 132 is energized the armature is drawn in the other direction. These magnets 129 and 132 are connected in multiple by a wire 1341 to the line wire 30. The armature 133 carries a contact arm 135 which is connected by a iiexible wire 136 with the wire 134. rlilhis contact arm oscillates between contact points 137 and 133 so that when.. the magnet 129 is energized the arm 135 contacts with the contact 133 while when the magnet 132 is energized the arm 135 contacts with the contact 137. These contacts 137 and 138 are connected by wires 139 with motor leads 140 and 141, the lead 110 being connected to one iield winding 1112 of a motor 143 while the lead 111 is connected to a second iield winding 1111 of said motor, the motor being, iike that in the rst instance of the double eld type. Ait 145 is the third or return motor lead which is connected by a wire 146 with the line wire 31. Bridged across between the wires 107 and 128 is a condenser 117 while a similar condenser 143 is bridged between the wires 115 and 131. Connected to the respective wires 107 to 110 are signal lights or other indicators as shown atg19 and these indicators are connected in multiple by a wire 150 to the line wire 30.

1n order that several devices may be controlled by the same variation in conditions which is used to actuate the bar 32 the re spective arms 102 to 1041 may be provided with extra Contact members 151 which engage contacts 152 and 153 similar to the con ta-cts 105 and 106 and like them connected to a limit switch 13 which -is precisely similar in all respects to the previously described limit switch which is distinguished by being indicated in general by the character A, the reference characters for the brushes and wires being indicated by the same numerals characterized by prime marks. For instance, the ngers are indi-cated respectively by 111?,

Leanser 112',113,114:',127,1'19,120,121, 122 and 130. The lead wires are of course indicated in like manner.

Moreover the arm 82 may be provided with the contact1511 which, under certain conditions engages a contact 155, theconditions being opposite those causing engagement of the contacts 87 to 90 respectively. lit will be obvious that the number of contacts and their connecting parts may be increased or decreased from that shown and it will also be obvious that only selected relay magnets 92 to 95 need be utilized to operate any auxiliary apparatus. rllhe contact 155 is connected by a wire 156 to a condenser 157 connected in turn by a wire 157 with the wire 150.

Furthermore the motor 143 is connected by a gear train 158 to the shaft 159 or' the limit switch.

1n order to illustrate how the device may be used to control or regulate a condition controlling device there has been shown in connection wlth Fig2 a due 160 the passage or gas through which is controlled by a damper 161. Mounted on the stem of this damper is a wheel 162 whereto are connected the cords or wires 163 which are led around guide wheels or idlers 164 to a driving wheel 165 on one of the shafts of the gear train. 1n pla-ce oi cords or wires sprocket chains may [be employed and the wheels 162 and 165 may be sprockets. By this means when the gear train is actuated the damper will be moved from one position to the other as will be obvious.

@ther apparatus has also been disclosed in this connection so that it may be seen that the device may be used for controlling all of the portions depending upon a given variable condition. For instance, there is shown in Fig. f2.` at 166 an engine governor which is connected to a lever 167 having adjustable ulcrum 163. Over the top of this sleeve is a shaft carrying a wheel 169 connected by Wires 170 to a wheel 171 on the same shaft as the wheel 165. Rotating with the wheel 169 is a cam. 172 which urges, when operated, the end of the lever 167 with which it contacts downward, this ac tion being el'ected of switch A revolves. 1n order to replace the lever, the cam returns to its originalv position," the engine governor forcing it to normal position and in order to increase speed.. o1 engine a slot is made in the cam at the normal position; the lever 167 to be raised rancher, a wire 173 leads to a solenoid 1711 having a core 175 connected to said lever 167, the solenoid being further connected by a wire 176 to the wire 61. By this means closing of contacts 15a and 155 will energize the solenoid and pull up on the core; Also the Stoker may be Astarted and stop ed, the Stoker being driven by a motor course when the limit' 17o To? supply power to this stoker line wires 178 are connected to a switch 179 to wires 180 and 181. The wire 181 is connected to, a rheostat 182 which is operated by means of a flexible cord 183 connected to a wheel 184 on the shaft with the wheels 165 and 171. This rheostat is also connected 'by a wire 185 to a manually operable rheostat 186 connected by a wire 187 through a varia'ble resistance switch 188 to the wire 1'81, the switch being also connected yby a wire 189 with the motor 177. Thus rotation of the switch A will operate the rheostat 182 and consequently vary the speed of the motor 177 in a well kno-wn manner. Furthermore, the engine throttle 190 may be controlled independently of the governor 190EL through the -medium of a lever 1'91 carrying a series of solenoid cores 192 connected to ,the lever by pin and slot connections, there also being employed a solenoid core 193 likewise connected with the lever, the cores 192 being surrounded 'by the solenoid coils 194 connected by wires 195 with the wires v107- to 110 respectively, the cores also being connected by wires 196 in multiple to a wlre 197 leading to the wire 150.

The core 193 is surrounded by a coil 198 connected by a wire 199 to the wire 156 and by a wire 200 to the wire 197. The arrangement of the cores is such that successive energization of the coils 194 from left to right will effect successive step by step movements of the lever 191 downward while energization of the coil 198 will effect movement of the lever upward. In this form of the device, the operation follows closely the operation of the previously described form. As for instance, if the condition is such that the bar 82 moves to close the contact 87 then the lmagnet 92 will. be energized which will cause closing of the arm 101 onto the contact 105 and thus willv establish a circuit from `the line wire 80 to the bar 82 through the contacts 83 and 87, the wire 91, the magnet 92 and wire 96 to the arm 101, from thence through its contact 105 and the wire 107 to the finger 111, to one of the bands or before-mentioned rings 124, the circuit being thus continued through the wires 24 and through the finger or brush 127 to the wire 128 so that the motor is driven in a forward direction. If the condition continues to vary in this same direction then the contact 88 will be closed which will result in energizing the armature 93. If the condition does not continue to vary in this direction however the limit switch will be turned until the finger 111 comes opposite the fbreak between the ring sections 124 when the circuit will be broken l and the motor stopped. If the magnet 93 be energized as aforesaid then the circuit will be restablished through the second finger 112`and the motor operated Yagain to turn the limit switch through another arc. This will continue throughout the entire series of magnets 92 to 95. Supposing that when the magnet 93 has been energized cond1t1ons cease to vary in the direction 4to carry the bar 82 upward inv Fig. 2 and retrograde. Then as soon as this takes place and the contact between 88 and 84 is broken the* magnet 93 will be denergized with the consequence that the arm 102 will close a contact with its .contact 106 so that a circuit will be established through the finger 120 and the ring with which it engages. Under these circumstances the circuit passes out through the finger 130 and the motion of the motor is reversed. The motor will continue to run in this direction until the finger 120 comes opposite the break between the I two |before-mentioned sections 124 of the limit switch whereupon the motor will cease to operate. If conditions still continue'to change toward normal then the magnet l92 will be denergized with consequent closing motor 177, cam 172, solenoids for the lever 191, and the switch B will all be controlled in like manner.

. In actualconstruction as shown on Fig. 5 and Fig. 6 it is preferred to mount the arm 13 on a bracket 201, which bracket is supported by a suitable base 202. The wire 12 is connected to a suitable terminal 202 on the base 202. Thus contact members 18 to 2l, inclusive are in the formo screws, which are adjustably mounted on resilient arms 203, which extend outwardly from a bracket 204, which bracket is secured to the base 202, above the arm 13. hese contactsl 'are held-in place fby set screws 205. The con* tact member 39 is similarly mounted on a bracket 206. These brackets are provided Vwith a plurality of holes so that the number of resilient arms may be increased ordecreased at will. Mounted on the base 202 is a Bourden tubeV 207, which is connected by means of a suitable pipe to a reservoir 208 to the upper end of which a pipe 209 is connected, leading directly to a boiler or other pressure organ. The reser- -voir 208 and the tube 207 are iilled 4with n been previously placed thereon,

two pieces, the pieces being connected together by means of a turn buckle .211 prelierably made of insulating material. rl`h1s rod extends upwardly through the arm 13 and is slidable on a pin 212, whichextends through a slot 213, in the rod. This pin 1s normally held in the lower end of the slot by coil springs 215, which are connected to the pins 212, and to the rod at 217. Pivotally mounted on the end of the arm 13, .remote from the end on which the contacts are mounted, is a rod 218, on which a suitable number of weights 219 may be mounted. llt will be obvious that, as the pressure on the water within the reservoir 208 increases, the arm 13 will be proportionately raised. The distance which it is raised, may be controlled by the turn buckle. For instance,if the device is to be used in connection with a boiler of 180 pounds pressure, the length of the rod 210 will be regulated so that the arm 13 will rise the proper distance upon an increase of pres-1 sure on the boiler. increase the pressure necessary to raise the arm initially, this may be done by removing a weight from the rod 218, a number having which weight will, ot course bear a suitable relation to the lever.

lin the embodiment of the invention shown in Fig. 9 ot the drawing, l have illustrated a second Bourdon tube 220, which is connected to the cylinder of a pump and has its free end connected to the arm 13 by a rod 221, which is similar to the rod 210 and which is connected to the arm on the opposite side of the pivotal point 222 to that on which the arm 210 is located, the construction of this rod being similar to the construction of the rod 210. rlfhus the variation of pressure in the pump cylinder will cause the arm 18 to operate in the reverse manner than will the pressure in the boiler, being on the opposite side ot the pivot, whereby tendency of failure of operation of the pump cylinder will procure an increased operation of the pump. llt will be noted that by reason of this particular construction of the Bourdon gage connection shown in Figs. 7, and 9 the fmovement of the arm 13 is accomplished in a smooth and steady manner while at the same ,time the spring support of the stationary contacts a'ords means by which this arm 13 can move uninterruptedly beyond the limit desired, this being the limit at which the contact 18 is set. llt will also be noted that by reason of this arrangement of contacts the dierential movement of the arm 13 is integratedA so that it is transformed into' a series of step-by-step move ments of the controlling motor.

t will be obvious that while this motor has been shown as controlling a damper it Should it lbe desired toy resine? may be utilized to control any one of a large number of devices which act to control the conditions in a body, for instance, the regulator may be thermostatically controlled and thus control the conditions in a chemical mixture to prevent excessive heat as in the manufacture of nitroglycerin and other explosives.

lt will be noted that by obtaining the pressure, which actuates the Bourdon tube, from a Pitot tube inserted in a pipe through which a fluid or gas is lowing under pressure, the condition control will be dependent on the product of the two variable quantities, namely pressure and rate of flow of the liquid or gas in the pipe.

Having thus described the invention, What is claimed as new, is:

1. ln a regulator tor condition controlling devices, a series of normally open primary circuits each including a fixed contact, a relay magnet, a circuit closing element movable into successive engagement with the xed contacts, a series of normally open secondary circuits adapted to be successively closed by the successive energization of the relay magnets, said secondary circuits including a relay having a magnet winding to which the secondary circuits are connected in multiple, a motor and normally open circuit therefor' closed by the energization of the secondary relay, and circuit breaker mechanism operatively connected to the motor and arranged to successively break the secondary circuits irrespective of the energization oi' the primary relays.-

2. ln a regulator for condition controlling devices, a series of normally open primary circuits each including a fixed contact, a relay magnet, a circuit closing element movable into successive engagement with said fixed contacts under the influence of changes in the condition to be controlled, a seriesoi normally open secondary circuits adapted to be successively closed by the energization of said relay magnets, a series of normally closed secondary circuits adapted to be successively opened by the energization of said relay magnets, said secondary circuits including a relay provided with a pair ci magnets to one ofl which the first series of secondary circuits are connected in multiple and to the other of which the second series of secondaryv circuits are connected in multiple, a double wound motor arranged to have a circuit closed through one of its windings by the energization of the iirst magnet or the secondary relay and to have a circuit closed through lits other winding by the energization of the second magnet of the secondary relay, and circuit breaker means, operatively connected to the motor and arrangedv to successively break the secondary circuits irrespective of the energication or the primary relays.

3. In a regulator for condition controlling devices, a series of normally open primary circuits each including a fixed contact, a relay magnet, a circuit closing element movable into successive engagement with the fixed contacts, a series of normally open secondary circuits adapted to be successively closed by the successive energization of the relay magnets, said secondary circuits including a relay having a magnet winding to which the secondary circuits are connected in multiple, a motor and normally open circuit therefor closed by the' energization of the secondary relay, said secondary circuit including a rotary switch arranged to successively open the closed circuits, and a gear train connecting the motor and switch.

4. In a regulator for condition controlling devices, a series of normally open primary circuits each including a fixed contact, a relay magnet, a circuit closingelement movable into successive engagement with said fixed contacts under the influence of changes in the condition to be controlled, a series of normally open secondary circuits adapted to be successively closed by the energization of said relay magnets, a series of normally closed secondary circuits adapted' to be successively opened by the energization of said relay magnets, said secondary circuits including a relay provided with a pair of magnets to one of which the first series of secondary circuits are connected in multiple and to the other of which the second series of secondary circuits are connected in multiple, a double wound motor arranged to have a circuit closed through one of its windings by the energization `of the first magnet of the secondary relay and to have a circuit closed through its other winding by the energization' of. the second magnet of the secondary relay, said secondary circuits including a rotary `switch arranged to successively open the closed circuits, and a gear train connecting the motor and switch.

5. In a regulator for condition controlling devices, a series of normally open circuits, a rotatable switch drum, split bands on said drum having their ends spaced apart at different radial portions of the drum, a pair of contacts in each circuit engageable with the drum, switches in said circuits controllable by progressive difference of like character inthe condition to be controlled for -relav magnets, said secondary circuits including a relay having a magnet winding to which the secondary circuits are connected in multiple, a motor and normally open circuits therefor closed by the energization of the secondary relay and circuit breaker mechanism operatively connected to the motor and arranged to successively break the secondary circuitsirrespective of the energization of the primary relays.

7. In a regulator for condition controlling devices, a series of normally open primary circuits each including a fixed contact, a relay magnet, a circuit closing element movable into successive engagement with the fixed contacts, two Bourdon tubes operatively connected to said element and to parts of the controlled system in which pressure conditions may vary, a series of normally open secondary circuits adapted to be successively closed by the successive energization of the relay magnets, said secondary circuits including a relay having a magnet winding to which the secondary circuits are connected in multiple, a motor and normally open circuit'therefor, closed by the energization of the secondary relay and circuit' breaker mechanism operatively connected to the motor and arranged to successively break the secondary circuits irrespective of the energization of the primary relays.

In testimony whereof, I affix my signature, in the presence of two witnesses.

ARTHUR WILLIAMSON GREENE.

Witnesses:

C. E. CoRTLAND, BENJ. I-I. BERRY. 

